So, I've seen a few questions about the search function in the Ops Center doc library. This is a bit embarrassing, since the search function is supposed to answer questions instead of creating them. But, I figured I'd go over how the search works and how to tweak its settings.
Basically, the default setting for the search is based on where you are. If you do a search from the main page of docs.oracle.com, it will cover literally every product library:
If you do a search from the Ops Center library, it will default to only searching the Ops Center library:
You can click Select in the categories on the left to see the current search options (and change them if need be):
If you're trying to find something within a specific book, then you can open up the book and then use the search box on the left:
Those are the basics of the search function in Ops Center.